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Q: I want to install Yosemite onto an external hard drive, and keep Snow Leopard installed on the internal hard drive. I want to be a ... I want to install Yosemite onto an external hard drive, and keep Snow Leopard installed on the internal hard drive. I want to be able to boot from either system, depending upon circumstance (at least until Yosemite is stable). Is this possible? more
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Jan 28, 2015 7:12 AM in response to pepaw14by Japib,It is possible. I'll let you read some articles that cover the setup:
Starting from an external USB storage device (Intel-based Macs) - Apple Support
or
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Jan 28, 2015 8:09 AM in response to Japibby pepaw14,Thanks Japib. I'll read these articles and a few others and see where it leads me.
Thanks again.